The solid-liquid equilibrium data on a faceted-nonfaceted system involving diphenyl and succinonitrile show the formation of a eutectic (0.9679 mole fraction of succinonitrile) and a monotectic (0.0742 mole fraction of succinonitrile) with a liquid miscibility gap in the system. From the linear velocity of crystallization data on the pure components, the eutectic and the monotectic, determined by the capillary method at different undercoolings, it can be inferred that they obey the Hillig-Turnbull equation. The microstructural investigations show peculiar characteristic features in the eutectic and the monotectic.